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TOXICOLOGICAL STUDIES OF METHOMYL INSECTICIDE WITH DIAPAUSE AND NON‐DIAPAUSE SOUTHWESTERN CORN BORER LARVAE
Author(s) -
GAYEN APURBA K.,
KNOWLES CHARLES O.
Publication year - 1982
Publication title -
entomologia experimentalis et applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 83
eISSN - 1570-7458
pISSN - 0013-8703
DOI - 10.1111/j.1570-7458.1982.tb03146.x
Subject(s) - methomyl , biology , diapause , larva , toxicology , botany , agronomy , pesticide
Methomyl insecticide was appreciably more toxic to non‐diapause larvae (NDL) than to environmentally induced diapause larvae (EIL) of the southwestern corn borer when applied topically (84.8 times) or by injection (18.5 times). Although differential penetration and/or metabolism probably played a role in methomyl selective toxicity, it seemed likely that other factors also were involved. It was suggested that the increased lipids and proteins in EIL as compared to NDL possibly served to reduce circulating levels of “free” methomyl with concomitant decrease in toxicity. This study has demonstrated that NDL and EIL of the southwestern corn borer differed in their response to a conventional insecticide. ZUSAMMENFASSUNG Toxikologische Studien mit dem Insektizid Methomyl an Diapause‐ und Nichtdiapauselarven von Diatraea grandiosella Das Insektizid Methomyl war deutlich toxischer für Nichtdiapauselarven (NDL) als für Diapauselarven (EIL) von Diatraea grandiosella und zwar bei topicaler Anwendung (84,8x) und bei Injektion (18,5x). Obwohl unterschiedliches Eindringen und Metabolismus eine Rolle spielen könnte für die selektive Toxizität, schien es wahrscheinlich, dass auch andere Faktoren beteiligt sind. Es wurde vermutet, dass die in EIL gegenüber NDL vermehrten Lipide und Proteine möglicherweise den Gehalt an “freiem” Methomyl reduzierte, was die Toxizität abnehmen liess.

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